/Engine/Source/Runtime/Engine/Classes/Engine/World.h
Dissociates the passed in level from the world. The removal is blocking.
void RemoveFromWorld ( [ULevel](API\Runtime\Engine\Engine\ULevel) * Level, bool bAllowIncrementalRemoval, [FNetLevelVisibilityTransactionId](API\Runtime\Engine\GameFramework\FNetLevelVisibilityTransactionId) TransactionId, [ULevelStreaming](API\Runtime\Engine\Engine\ULevelStreaming) * OwningLevelStreaming )